Chimney ventilator



June 17, 1930.

A. MCDONALD El". AL

CHIMNEY VENTILA'IORv Filed Dec. 8, 192'? 3 ShetsSheet l June 17, 1930.

A. MCDQNALD Er AL CHIMNEY VENTILATQR Filed Der). 8, 1927 3 Sheets-Sheet', 2

June; 17, 1930. A, MCDONALD ET AL 1,764,219

CHIMNEY VENTILATOR Filed DBC. 8, 1927 3 Sheets-5h66?l 5 gwwnto Mc Donald,

1W. o. ama/7,

Patented June 17, 1930 Y UNITED STATES, PATENT OFFICE ALEXANDER MCDONALD, OF PITTSBURGH, AND

WILLIAM O. SMITH, OF WILKINSBURG,

PENNSYLVANIA, ASSIGNORS OF THIRTY PER CENT TO'y SAID SMITH AND SEVENTY PER CENT TO JOHN C. YOUNG, OF PITTSBURGH, TPENNSYLVANIA.

CHIMNEY VENTILATOR Application filed December 8, 1927. Serial No. 238,540.

' The invention relates to chimney ventilators. f

The object of the present invention is to improve the construction of chimney ventilators and to provide a simple, practical and eflicient chimney ventilator of strong, durable and comparatively inexpensive construction provided with means for producing an upwardly directed current of air about its upper end and to create a strong draft within the chimney. Y

It is also an object of the invention to provide a chimney ventilator of this character in which the means for causing an up-V wardly directed current of air will constrict the same as it passes upwardly and inwardly into the ventilatorY and thereby increase'the velocity of the current of air and the effectiveness of the same in creating an updraft within the chimney.

A further object of the invention is to provide a chimney ventilator of the character stated which shall be adapted to be readily adjusted in a manner to permit of its being used in connection with a. chimney of any size. V

lith these and other objects in view, thel invention consists in the construction and novel combination and arrangements of parts hereinafter fully described, illustrated in the accompanying drawings and set forth in the claims hereto appended, `it being understood that changes in the form, size and minor details of construction, within the scope of the claims, may be resorted to' without departing from the spirit of the invention or sacrificing any of' the aclvantages thereof.

In the drawings:

Figure l is a view in side elevation chimney ventilator.

Fig. 2 is a top plan view of the chimneyY ventilator.

Fig. 3 is a sectionaly view taken on a plane extending vertically and centrally through the chimney ventilator.

Fig. 4. is a perspective view-of two of the sections of the chimney ventilator.

of the Fig. 5 is a sectional view of one 'side of thel chimney ventilator, section being taken on the line 5 5 of Fig. 3. y

Fig. 6 is a sectional view taken on the plane indicatedby the line 6 -6 of Fig. 2. Y Fig. 7 is a detail perspective view of one of the vane holding clamps. f Fig. 8 is a detail view of one of the central partitions.

Fig. 9 is an enlarged detail vertical' sectional view on the line 949 of Fig. 5. Fig. l0 is a perspective view of the section of the chimney ventilator which slidably interlocks with the right-hand section shown in Fig. 4.

In the accompanying drawings, in which is illustrated the preferred embodiment of the invention, the chimney ventilator comprises a main pipe l, the lower end portion of which is adapted to have a snug fit in the I chimney, an auxiliary pipe 2 which lis shorter than the main pipe and arranged in spaced relation to and about the upper end thereof, and lower and upper air deflecting frusturns 3 and 4, respectively, which are located below the auxiliary pipe and adapted to direct air entering between-them to and through the space 5 between the main and auxiliary pipes. The air passes directly' upward from the space 5 and creates within the chimney.

The mainpipe l is rectangular in plan. It is of sectional formation, and each of the four sections thereof consists of right angularly related and vertically disposed plates 6 and 7. The plates 6 and 7 of certain of the sections are provided at their upper and lower edges with inturned flanges 8 which slidably receive the upper and lower edges of the remaining sections, so as to slidably and adjustably `connect the sections together in a manner to permit the sections to slide inward and outward to enable the horizontal dimensions of the main pipe l to be varied. Certain of the plates of the sections are provided with horizontally arranged slots 9, to receive the uncut portions of the cooperating sections so as not to interfere with the said inward and outward horizontal sliding movement of the sections to vary the size of the chimney ventilator.

a strong updraft f CIT The auxiliary pipe 2 is also rectangular in plan and of sectional formation. Each of its four sections consist of vertically disposed and angularly related plates 10 and 11. The upper edges of certain of these sections are provided with inturned flanges 12 which slidably receive the corresponding edges of the remaining sections, so as to adjustablyl connect the sections `in ama-nner to permit the horizontal-dimensions of the auxiliary pipe 2 to be varied.

The lower frustum 3 is of sectional formation, and each of the four sections' thereof consist of right angularly related plates 13 and 14. These sections are provided at their inner or upper f-edgesfwitlr upstanding flanges 15 and atthei'r'outer lor vlower edges with inturned flanges 16. The respec tive sections Aof this frustum are` secured to the respective sections'iofthe main pipe 1 through the mediunrofthe flanges 15. The flanges 16 `of certain of these frustum sec.- tions fit in the corresponding :flanges jof the remaining frustum sections, so as toL permit these sections to be adjusted relatively while the horizontal dimensions Vof the main pipe 1 are being varied. Portions of theinner or upper edges of certainof the plates 13 and 14, are cut away or recessed beyond the attaching portions -or flanges l15, Yas clearly illustrated in Figs. 3, Qand 10 ofthe drawings, and are therebyspaced from certain of the plates 6 and 7 of the main pipesections, so as to provide clearance Aspaces or vslots 17 which, together with the slots Q,reCeiveLthe inner portions of-the remaining vplates 13 and 14. Asthe frustumsections are slidably associated, and 'as thel respective frustum sections are fixed to the respective main pipe sections, the horizontal dimensions of the frustum will be varied -as the corresponding dimensions ofthe main pipe' sections are varied. The-interfitting slotted portions of the sections vof the-mainpipe. andthe sec tions of the lower frustum interlocki the said sections against lat-eral separation.

The upper frustum 4 is similar tothe lower .frustum 3, and thegplates 18 and 19 of the respective sections thereof are arranged at right angles andprovided at their lower or outer edges with inturntd` flanges 21. The inner or upper edges of the respective sections of-this frustum are connected to the lower edges of the respective'sections of the auxiliary pipe 2. The flanges 21 ofthe respective sections are slidably associated, so as to permit the horizontal dimensions-of this frustum to be Varied'as the corresponding dimensions of the main pipe 1 are Varied.

`The respective-sections ofthe auxiliary pipe 2 and frustuml 4 are secured to and supported'from therespective sections of the lower frustrum 3 by diagonally disposed plates 22which arefsecured to and between the frustum sections at the corners thereof. The plates 22 are arranged in pairs and the members of each pair are fitted flat against each other and secured together by rivets 22a or other suitable fastening means to provide spacing and supporting elements of two plies or thicknesses. The pairs of plates are provided at their upper and lower edges with Alaterally extendingffianges 22band 22, which-are riveted or otherwise secured to the Yupper and lower tapered members or frustums. The plates 22 form partitions and divide the space between the upper and lower frustums 3 and 4 into a plurality of inwardly and upwardly tapering compart ments which communicate at their lower or outer ends with the atmosphere and at their inner or lupper ends withthe, space 5 and their inward taper tendsto increasethe velocity offthe air currents and render the same more effective in creating an upward draft within the chimney.

Vanes 23 are secured to theupper faces of the upper frustum 4 andeto the outer faces of the sides of the -auxiliarypipe 2.by U-shaped clamps 24. The vvanes have-angularly related upper and lower portions, the upper portion being'vertical and the lower portion inclined. Each vane is constructed of a single piece of sheet metal folded longitudinally to provide abody portion of two plies lor thicknesses. Theside edges of the sheet metal are bent outwardly to form laterally extending flanges 26. In the manu* facture of the vanes a portion of the body of thel vane is removed'and the flange is bent transversely to form the angularly related portions and the adjacent ends of the severed portions of the body are secured together by soldering or other suit-able means. The angularly related upper and lower'portions of the vanesv may, however, be formed in any` desired manner, as will be readily understood.

The clamps 24y saddle 'the upperedges of the auxiliary pipe 2 and the `outer sides of the U-shaped clamps are bifurcatedor slotted at 24a to permit the clamps-to stradolley the body -portion of the vanes and engage the laterally extending flanges at opposite sides of the said body portion. The clamps 24 are secured in placel byV set screws 25 which also serve to secure the sections of the ventilator in adjusted position. The vanes 23 are positionedcentrallyof the sides of the frustum 4 and'tliey extend fromthe upper edge Aof the auxiliary pipe 2 tothe lower edge of the frustum. The flanges 26 are located at the inner edges of the vanes 23 and fit against the auxiliary pip-e 2 'and the frustum 4 yand both flanges 'are engaged by the bifurcated outer side of the clamps.

From the foregoing description, tak'enin connection with the accompanying drawings, itV shouldkv be apparent that 'the ventilator ico may readily be adjusted so as to adapt it for use in connection with a chimney of any size. The lower end portion of the main pipe l ts in the chimney and the lower edge of the lower frustum 3V rests upon the chimney. The Aair entering the compartments formed by the frustuins 3 and 4 and the plates 22 passes upwardly through the space between the main pipe 1 and auxili-v ary pipe 2. The air passes upwardly from the space 5 and creates a strong updraft in the chimney. The air impinging against the upper side of the rustum 3 is caused to travel upwardly between the main pipe l and auxiliarypipe 2 due to the inclination of the frustum, and this current of air as- Sists in creating a strong updratt in the chimney. |The air currents striking the outer surfaces of the frustum take a similar course, which adds to the upward pull on the contents of the chimney.

The upward current of air may be further strengthened, especially when the wind is striking the corners of the chimney ventilator, by means of centrally arranged partitions 27 disposed in vertical planes and conforming to the shape of the space between the upper and lower frustums or hollow members and extending to the main tube. The central partitions 27 are each con structed of a single piece of sheet metal folded longitudinally to form a body portion of two plies or thicknesses and having its side edges bent outwardly at right angles to form laterally extending flanges 28 which are located at the lower edge of the central partition. The inner end of ythe centrally arranged partition is tapered as shown to arrange the inner end edge in a vertical position to lit against the main pipe. The outer end edge of the central partition is arranged perpendicular to the outer edge,

which is disposed at an inclination. This square construction of the outer end of the central partition will cause the upper outer corners 29 of the central partition to project beyond the upper frustum. By projecting the upper outer corners 29 of the central partition beyond the other parts of the apparatus, the central partitions are adapted to catch and direct more air into' the divided spaces or compartments, than would be the case were the outer edges of the central par` tition arranged in vertical planes similar to the outer end edges of the diagonally disposed plates 22. The central partitions, which also brace and Vincrease the strength and rigidity of the projecting portions of the chimney proper, are secured in position by bottom clamps 30 constructed in the same manner as the clamps 24 heretofore described, and engaging the laterally extending flanges of the central partitions and the lower frustum of the chimney ventilator.

. One clamp at the bottom of the central partitions will be suiicient to secure the same rmly in position between the uppervand lower frustums.

It should be understood that the drawings are merely illustrative and do not pretend to give exact proportions Furthermore, the said drawings are illustrative of a preferred construction, it being our expectation that various changes and modications may be made without departing from thespirit and scope of our invention.

Vhat is claimed is:

l. A chimney ventilator comprising a main pipe consisting of angular sections, means slidably connecting the sections, a lower frustum consisting of angular sections and secured to the sections of the main pipe, an upper rustum consisting of angular sections and secured to the sections 0f the lower frustum, and an auxiliary pipeV consisting of angular sections secured to the sections of the upper trustum and spaced from the main pipe, the sections of the lower frustum and the main pipe having interiitting slotted portions interlocking such sections against lateral separation.

2. A chimney ventilator comprising a main pipe consisting of angular sections, means slidably connecting the sections, a lower frustum consisting of angular sections and secured to the sections of the main pipe, an upper frustum consisting of angular sections and secured to the sections of the lower frustum, 'an auxiliary pipe consisting of angular sections secured to the sections of the upper rustum and spaced from the main pipe, and means for securing the sections against casual relative movement, the sections of the lower frustum and the main pipe having interitting slotted portions interlocking .such sections against lateral separation. y

3. A chimney ventilator comprising relatively adjustable sections, vanes, and tastening means securing the vanes in place, said fastening means` also holding the sections against relative movement. y

4. A chimney ventilator comprising a main pipe, an" auxiliary pipe arranged in spaced relation to the main pipe, upper and lower deflecting frustums carried by the said pipes and arranged in spaced relation, the space between them communicating with the space between the said pipes, and diagonally disposedpartitions for dividing the space between the frustums y into inwardly and upwardly tapered compartments for increas ing the velocity of the air currents passing upwardly through the space between the said pipes, said partitions consisting of plates arranged in pairs and secured together to form spacing and supporting elements and having their upper and lower edges bent laterally to form attaching flanges.

5./A chimney ventilator comprising a frustum,

frustum provided with an upper vertical portion, vanes having angula-rly related upper and lower portions and provided with laterally extending flanges fitted against the said upper and lower portions of the 'said frustum, and substantially Ll-shaped clamps saddling the frustum and the fianges and securing the vanes to the frustum.

6. A chimney ventilator comprising a frnstum provided with an upper vertical portion, vanes having angularly related upper and lower portions and provided with laterally extending flanges fitted against the said upper and lower portions of the said and approximately `LJ-shaped clamps saddling the frustum and provided with bifurcated upper portions straddling the vanes and engaging the laterally extending flanges.

7. A chimney ventilator including a frustum having a vertical upper portion, vanes having angularly related upper and lower portions and each consisting of a piece of sheet metal folded longitudinally to provide a body portion of two plies or thicknesses and having its side edges bent 'outwardly to form laterally extending flanges, the latterbeing fitted against the exterior of the frustum, and substantially U-shaped clamps saddling the upper and lower edges of the frustuin and having bifurcated upper portions straddling the outer portions of the vanes and engaging the laterally extending flanges.

8. A chimney ventilator comprising'v a main pipe consisting of angularly related sections, certain of the sections being provided at their upper andjlower edges with inturned flanges forming ways slidablyre- L" ceiving the upper and lower edges of the adjacent sections, a lower frustum consisting of. angular sections secured to the sections of the main pipe and having inwardly bent lower edges slidable on each other, the sections of said lower frustuin being secured to the sections of the main pipe and certain sections of the main pipe and the lower frustum being provided with horizontally disposed cut away portions to permit the sliding of the adjacent sections, an upper frustum provided with a vertical upper portion forming an auxiliary pipe, said upper frustum and auxiliary pipe consisting of' angular sections, certain of the sections beingprovided with inwardly extending flanges forming ways slidably receiving the adjacent sections, and means for supporting the upper frustum and the auxiliary pipe in spaced relation` with the lower' frustuin and the main pipe.

9. A chimney ventilator comprising a main pipe consisting of angularly related sections, certain of the sections being provided at their upper and lower edges with maimed etages forming ways Siicabiyra ceiving the upperfand lower edges'o'f the adjacent sections, a lower frustuin consisting of angular sections secured tothe sections of the main pipe and havinginwardly bent lower edges slidable on each other, the sections of said lower frustum'being secured to the sections of the main pipeand certain' sections of the main pipe and the lower frustuin being provided with horizontally disposed cut away portions to permit lthe sliding of the adjacent sectionsfan upper frustum provided with a vertical upper portion forming an auxiliary pipe, said upper frustum and auxiliary pipe consisting of angular sections, certain of the sections being provided with inwardly'extending flanges forming ways slidably receiving thei adjacent sections, and diagonally disposed' partitions interposed between the upper 'andlower frustums and secured tothe same and supporting the upper frustum and theauxiliary pipe in spaced relation with the lower frustuin' and the main pipe. y y

10. A chimney ventilator 4comprising a main pipe, an auxiliary pipe spacedfrom the main pipe to provide an intervening passage, upper and lower frustumsfarrang'ed in spaced relation fexteriorly ofthe main pipe, the upper frustuni being spaced from the main pipe to form a passage, connecting with the lower end ofthesaid passage'between the main and auxiliary pipesexteriorly arranged vanes extending acrossthe Anpper faces of the upper fru'stuin and having laterally extending flanges fitted'again'st'the same, vertically disposed partitions conforming to the shape of the space between the frustums and located in the 'same vvertical planes as the vanes and having laterally extending flanges fitting against the upper faces of the lower frustum, and fastening means for securing the laterally extendingflanges of the vanes andthe partitions to the frustums. i j

11. A chimney ventilator comprising a main pipe, upper and lower frustums arranged in spaced relation exteriorly of the main pipe, the upper frustum being spaced from the main pipe to form a passage, exteriorly arranged vanes, vertical' partitions conforming to the shape of the space between the'frustums andhaving tapered inner ends to fit the main' pipe and provided with substantially square outer ends forming projecting portions extending beyond the frustums for directing the air in the spaces between the latter.

In testimony whereof, wehave hereunto aflixed our signatures at Pittsburgh, in the county of Allegheny and State of Pennsylvania, this 23rd day of November, 1927.

ALEXANDER MCDONALD. WILLIAMO. SMITH. 

